The system has:
- No solutions for two parallel lines.
- 1 solution for two nonparallel lines.
- Infinite solutions for two equations that describe the same line.
<h3>How to identify the number of solutions for the systems?</h3>
A system of two linear equations is given by:
y = a*x + b
y = c*x + d
1) The system has no solutions when both lines are parallel lines, this happens when both lines have the same slope and different y-intercept.
y = a*x + b
y = a*x + d
2) The system has one solution when the lines have different slopes:
y = a*x + b
y = c*x + d
3) The system has infinite solutions when both equations describe the same line:
y = a*x + b
y = a*x + b
If you want to learn more about systems of equations:
brainly.com/question/13729904
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If you add the two polynomials together, you will have:

To find the number of books sold in 2002, we just have to input 4 for t because it is 4 years after 1998.
If done correctly, you will have 820 million books sold.
The answer is 0.019 i think
<span>x − y + 2z = 1
3x + y + 5z = 19
2x − y − 2z = −17
-3x+3y-6z=-3
</span>3x + y + 5z = 19
4y-z=16 (1)
-2x+2y-4z=-2
<span>2x − y − 2z = −17
y-6z=-19 (2)
</span>4y-z=16 (1)
y-6z=-19 (2)
4y-z=16
-4y+24z=76
23z=92
z=4
y-6z=-19
y-6×4=-19
y-24=-19
y=24-19
y=5
<span>x − y + 2z = 1
</span>x-5+2×4=1
x-5+8=1
x+3=1
x=-2
(x,y,z)=(-2,5,4)